Signal-transmitter for telephone-exchanges.



G. W` LORIMER.' SIGNAL TRANSMHTER PoR TELEPHONE EXCHANGES.

` APPLICATION FILED A`PE.11, 1906. RENEWED AUG. 7, 1911. 1,024,088.

O O O :5555:: Q

o G 0 E mw G. W. LORIMBR. SIGNAL TRANSMITTER FOR TELEPHONE EXCHANGES.APPLICATION FILED APR.11, 1906. BENEWED AUG. 7, 1911. Ig Patented Apr.23, 1912 G. W. LQRIMER. SIGNAL TRANSMITTER FOR TELEPHONE EXCHANGES.PPLIGATIN FILED APB.. 11, 1966. BBNEWED AUG. 7, 1911. :i gggggsgggf, VPatented Apr. 23, 1912.

6 SHEETS-SHEET 3.

G. W. LORIMER. SIGNAL TRANSMITTER P03 TELTPHQNE EXCHANGES. IlAPPLICATION IILBDYAPE. 11, H906. BENEWED AUG. 7, 1911.

Patented Apr. 23, l92.

6 SHEETS-SHEET 4.

lill@ G. W. LORIMBR.. SIGNAL TRANSMITTER FORTBLEPHONE EXCHANGES.

APPLIGATIONPILED APB..11, 1906. RENEWBD AUG. 7, 1911.

Patented @1129. w12.

e SHEETS-SHEET 5.

G. W. LORIMER. SIGNAL TRANSMITTER 120B. TELEPHONE EXCHANGES. APPLEGATIONFILED APB.. 11, 1906. RENEWED AUG. 7, 1911. f Eatented Apz. 23, 1912 6SHEETS-SHEET 6.

. Longman, fvenra desired to be selected.

UNITE GEORGE W. Lorrains, or moua, omo, Assiettes, su musas.assieme/Innes, ro WESTERN ELECTRIC COMPANY, A consonantes or ILLINOIS.

SIGNAL-TRANSMITTER FOR TELEPHONE-EXCHANGES.

Specification. of Letters Patent.

rasanten api. as, wie.

Application filed April 11, 1906, Serial No. 311,139. Renewed August 7,19M. Serial No. 642,818.

Be, it known that I, Geenen WV. Lonnmn, a citizen of the United Statesot America, and a resident ot Piqua, county of Miami, and State of Ohio,have invented a new and useful Improvement in Signal-Transmitters forTelephone-EXchanges, of which the following is a speclication.

M v invention relates to substation equipments in automatic telephoneexchanges, and has t'or its object the transn'lission and control ofelectri :al signals or impulses by 'ay ot the telephone line between thesubstation and the central olHcc, and the prevention ot' accidental orintentional interference with the transmission and control of theseimpulses or signals by a wrong act on the part of a person operating myinvention.

The general character of the automatic exchange system with which myinvention is designed to operate is as follows: The cen-- tral oilieccontains eircuit-selectingl switches so related to each other and toother circuitcontrolling devices lo enable any line entering the centralolliec to be placed in connection with any other line entering thecentral oliiee and not already engaged. The circuit-selecting switchesandY their associated devices are ot' a type in which certain of theoperationsare performed by the rotation ot' circuit-carrying brushesover circuit-carrying contacts, this rotation being adapted to hearrested at a time when the brushes are in engagement with the contactsThis central oiiice equipment and the device ot in v present inventionare adapted for use with ltelephone lines of two wires each. The earthmay serve as a third conductor t'or common use hy the many substationsand the central oflice. or in lieu of the earth a. common returnconductor may he used. Electric current for the operation of thecircuit-selectinff switches and associated devices in the centrzilo'liice and of electromagnetic mechanism at the substation is providedfrom some convenient source, preferably located in the central otlice.

Upon a call beine instituted by a. substation, t-he central o cemechanism responds to the temporary grounding of one of the wiresleading to the substationand as a resultot current tlowing from thecentral oilice over that Wire to the substation ground places the linesocalling in a relation to the 'circuit-selecting switches such that thesucceeding operations of selecting the called line may proceed. vin'this process of selecting,r the-called line the central otliceequipment sends impulses to the substation, these passing over thc wireol thevline which. was not used for the preliminary impulse above desibed. The result of this series of impulses is to produce synchronousmotion of parts4 in the substation and in the, central otlice. "lhecircuits and moving parts in the central otlice are so, arranged thatwhen, during this series of impulses over one ot the wires, a groundshall be placed vtempinarily on the other wire atthe substation, thecircuit-selecting switch then in motion at the central oliice will hearrested in its motion as a result of the impulse caused by thatgrounding. As a plurality ot'central office switches may be associatedsuccessively with the calling line, one at each of several'dit ferentoil the setting up of a connection, so the entire series of impulsesunder description may be divided into several groups, each correspondingto the progressi ve motion of one central. office switch, and eachadapted to stop that motion when an impulse is produced, as described,in the wire not used for the series of impulses which controlsynchronism.

It is thus the object of my invention to respond to impulses in onecircuit and by motion of itsv parts to malte such contacts as will causeimpulses in another-circuit, to the. end ot' placing its own line inconnection with a desired other line.

ity invent-ion is illustrated in the follow-- ing drawings 'in whichsimilar letters refer` to similar parts throughout the several views,and in which:

Figure l is a front view; Fig. 2 va rear view; Fig. 3 a rear view withcertain parts removed; Fig. t a view of the hook switch for thetelephone receiver; Fig. 5 a section on a central line indicated in Fig.F2; Fig.

6 a detail ot' the gear train; Fig. 7 a sectional view as indicated inFig. 2; Fig. 8 a sectional View as indicated in Fig. 2, Fig.4 9 acircuit of an instrument embodying my invention. Fig. 10 is a circuitdiagram of portions of the central oicc circuits and apparatus involvedin the operation of the call sending device described Vin thispplieation. Myinvention is adapted to he 4.associated with telephoneiistrnn'ients of the usual type, hitting a tra` .emitter and a receiverwith sueh other elements are requishe for the t a pro" f' substationtelephone ii the particular system cator hy which the si'ihsoriher mayset op lily before him t digits of the number the linel'ie wishes toeall. iueh an indi for use 'with 'my press invention reto he able toinalie certain connections later herein, and nuN "1121er uit tei-nis ilimita- "52 t other M i n is viewed and the rotation l the ligure showsole? S and .35 it will il. supports all ure ot' the driven train `oit ledhy oertain red hy the shaft l2 and rnu down by the ropement 311-. Thespring by n driven is l5, one end or' ed to the disk 1G, hy the post :u:other the post E8 with which "sl: 'i6 in conventi-ie. This post. 18 isatti ed to the is joined hy the link i l 1 more elearlj. shown in Fig.C. ifnis junction is on. smh surf: in the two disks and at such angularpositions. as to eause ieni to rotate in similar diria-tions and :itsimilaiiiit i' elle two iii t were rigidly i slush..

loaf.' mounted on the huh een, h ratehet-x`vlwel 532t the but tour teethin its periphery, ing equally spaced at intervals of (ingrese.v as nioreclearly .shown in dist'. .tti further has two stops eutI in itsperiphery, one, 23, being adapted se to he engaged bythe lng 2li on the.haelt of the switch hook Q5, eno. the othen 26, 'being adapted to heeugugd 1ey the tooth of the 9i". Y= shaft iii, when turned in thedirection ,indicated hy the sri-ow, in Fig. 1, tends ratchet in 30.

rampes he turned by a clockwise rotation of the' shaft 12 hy the handle13.` Such a rotation ot the disk will cause a similar rotation oi thedisk 16. The disk Q0 Carries another pin whose office it is Awhen innormal position. shown in Fig. 2, to engage the flat spring 3l in thepawl 35, keepin' the tooth of the latter out ot' engagement with thedisk frli, although this pawl would other- .Wise he drawn into suchengagement hy the sprinp; o, that is, the pawl Willengage the disk Si.preventing a clockwise motion from normal position, unless the pin 33holds the pawl out of sneh engagement.

The dist: 30 is a ratchet Wheel having about s quadrant of its peripheryeutwith teeth adapted te he engaged by the pawl 37. By rotation ot' theshaft 19 successive teeth are engaged hy the pawl 37', which is normallyin engagement with. the iirst tooth. 'But the handle 13 cannot be turnedhaekward until' it has heen turned far enoughl for the paWl or to passall the teeth which are ont and ride upon the uncut periphery ot thedisk 30, for the following reason: As the outer line of the teeth-inthis ratchet portion is in circumference of less diameter than the full:diameter of the disk 30, the pawl 3'( when on the full periphery will hethrown out. farther than in passing over the top ot any single tooth Atsuch a time, therefore. the pin B8 in the end of an arm of the paw] 3'?will he engaged by a Shoulder en theend of the pawl 39. Parvis 37 and139 are drawn toward each other by the spring et() and when theengagement he tween thorn neer-.rs at the pin 38, the tooth ot l? n'ilihe held ont of the ratchet in the disk 30, so that if otherwisepermitted this disk and the shaft. l2 may return in an antieloekwisedirection to normal position; out in so returning5 the pin y4H, carriedhy the disk 30. will engage the end of the "Liawi 3S)H tripping itsother and from the pin 38 and so allowing the pawl 37 to fail again intoengagement with the first tooth of the It will thus be seen that whileit is not possible to turn the handle "13 backward from any position inau ineom 'certfied' the gear 42. This gear carries the pawl 43, adaptedto engage eitherl of the four tecti in the periphery of the disk Thegear if.) is provided with a sleeve 44, which serres the double purposeotl a hub eoin'fentrie with the post 18 and of an axis for the sleeveQ1, which joins the disks 16 and EL). v`illhen, therefore, the clockwiseturning ot' the shaft 12 occurs, the described construction causes thedisk QQ to turn. The relation of parts is such that when the handle 13has turned the shaft 12 through the full anglo provided vfor it, thedisk Q2 has turned a quarter revolution and the pawl 43 has engaged thenext succeediiner tooth. As the spring is now wound up h v a quarterturn ot' the dist: 1G, it is exerting force tending; to tarn the' lini-a,clockwise direction, iie'wegl in Figz. But the spring 15 thus wound maynot run down at once. The ,2jaar at?! engages the spur 45, which iscarried on the saine shaft 4G as thegear 47, the spur 15, shaft,- Lttiand gear 47 being unit-1d together rigidly. The latter meshes with theworm 4S, whose shaft carries on one end the ecfapeinent 111-.

e elwtroinagnet 49 has an armature 50, the extreme end ot which is sorelated to tht` eseinwnien: 't4 that when the end of the armatureopposite the magnet poles is drawn toward and released 'from them theesf'apenirnt Vwill be allowed to advance step if; step. illternat'eteeth ot the esca-pement are hent in oin'iovsite directions. As shown:in itin' 2 and il, any tooth which is bent the worm tel will be engagedh V the ltffli. armature when it is attracted by the mag,- net lt);eimrersely, any tooth which is bent away trom the worm will be engagedby the armature when it is not attracted by the magnet it). 'l`o cause aflow ot current, therefor. through the magnet 4:9, alternatelyattracting and releasing' the arma- `tura 5t), will permit. the wormVft-S to rotate and thus permit the ruiming,` down of the spring in anamount Igoverned by the number -ot .imgulses through the magnet 49 andwith a correspontfling delinite rotation of tue shaft all. and others inthe train shaft t5 extends through the hase l1 to the trent, reaching'also coml\/ through the insulating;l disk 51. extreme end oi the shaft.ttt carries the ariu hut is instituted lroin it. The arm 52 is providedwith the brushes and fri. The tormer is adapted to engage any one Ot' a@plurality4 of conductingl pins or studs 55, mounted. in the insulatingydislt J1, on a circumference ijiavinn; the axis ot the shat't 46 as acenter. These conducting,` pins are shown in 1 5 and 9, and in thelatter ligure are shown as open circles it used conducting terminals forwires, or as solid circles it ther serve merely the purpose of "isthating stops upon which the brush 53 may rest between contacts withadjacent wire-connected points. The brush is held outward against thesepins by the retractile action ot the spring 5G and the brush 54 restsupon the ring` 5T, which, as shown in Fig. t), forms a terminal t'or aconductor ot' the circuits. rthis conductor is thus ronstantl)7 extendedto the tip ot' the brush 5B and no lectrieal connection exists betweenthe arm S2-and the shaft l1G which .carries it, as an insulating;`bushing', 58, in

Fig'. 2, to he engaged by the/lug Q4 on the back ofthe switch hook lt',then, the telephone receiver which this hook is adapted to carry shallnoty be on that hook, the lug` 24 will engage the slot 23, preventingthe disk 1G .t'rom rotating to wind up the spring' l5. l t is thereforeii'npossihle tor a patron to turn the handle y13 to institute a call.unless the receiver hook 25 he down. lt`i11'tlieiii'ioi'e, it impossibleto turn the handle after it has once been turned con pletel)Y to theright and allowed to return, because the pawl new engages the disk 3l,due to the absence of pressure of the pin 321 against the spring Whenthe disk 30 is in its normal position, before a call is instituted, thepawl G0 engages a tooth in its periphery. This tooth is distinct fromthat series forming the ratchet or the pawl 37, and permits the pawltitl, when engaged. by it, to keep its rear arm out. of engagement withthe pin (31, which projects irom the under side ot' the aruiature 50.TVhen the disk 30 is tirst. turned in calling, thcpawl tj() is lifted,and so by the )pin G1, the armature pressed toward its pole pieces,being so placed in a position similar to thaty into which it would beattracted it the magnet 4D were encrgized. During the Atall operating;yposition of the disk 30, therefore, the aruiati'ire 50I will he held asit' attracted by its magnets and may only be released to recede from itsmagnets when the pawl Gt) again drops into its normal piace whenthehandle 13 has gone hack to normalpositon. .seen therefore that ininstituting a-call the turning of the handle 13 clockwise and its returnanti-elockivise to the normal position will Ljive the armature 50 a.stroke, releasing the eseapement 14 by two teeth to advance the brush 53from the normal Contact pin 55, with a resulting effect on the circuits.It is at the step of the second tooth 1t will be 4; Lompoc that pin isabandoned by the brush 53. It will also be seen that duringa a movementof the handle 13 in instituting' a call no impulses iii the magnet i9could move the arm 50 to release` the escapeinent lll, esit ismechalzally held by the pawl 60 from any receding ntion from themagnet..

The' gear el? carries concentric with itsclt a disk GS?, which has onenotch in its ps riphery adapted to be engaged by s pin 63 on the underside of the pawl 27. The pawl 27 is lifted out of the notch Q6 in 'thedisk 16 when a call is instituted. it the saine time the pin 63 islifted out of the single notch in the disk (S2. As tho-gear 477 and thedish. 1G `both revolve, though in opposite dirsotions, when the. trainis beingl Iun down, and asthis gear :and dish are in the same train, theparts olf the paal .27 only return to engagement` as described when thetrain returns to the condition shown in Fig. 2. The. disk G2 ismotionless dni-ing the preliminary turningr of the disli lll to Wind upthe spring` l5. and the pin 63 is lifted out of the notch `of disk (32by the action of the en gagging' inclined surfaces ol notch 26 and pawl27, but when the trein vis running down, or returning to the conditionshown in F the gradual return of pawl 3i' to itsnormal position (hy thesliding of the inclined surfaces ol Q6 and 27) is provented by theengagement ot the 'pin G3 with the periphery o'l' the disk G2, wherebythe re- Aturn ot' the paul 27 is delayed until the disk (32 and rQ'eari7 have returned fully to 'their normal l ositions when by assine 7 bunder the piu lill ot' the abrupt shoulder of the notch of disk (32 thepawl I? is permit-- teil to return quickly into the notch 2G. Wlien thepawl 2' is being carried on the periphery of either disk lll or (l2, itsinsulat ing point (il forces together the two Contact springs (55 and(5G. while 1n the normal p0- sition otl the pawl 3T these springs areout ot' contact with each other.

The disk 3i) carries a conducting piece G7, but is insulated 'from it.This conductingl piece has no other electrical otioe than to nialcecontact iu the normal position of the disk 2l() between the sp1-ings 58and 39.

' lhe switch hook 25 aetuatos springs 70,7l,

72,78 and 74'. these being;` assembled so that certain contacts are madewhen the hook 25 is down and certain others are, made when it is up.'lho exact relation of the' contacts made and broken can be, best seenin Fig. E), in which the parts are conventionalized and in which thespring 7l oscillators between the parts 7U' and 72, while the spring 73is adapted only to make Contact with the piece 74 when the receiverison'tbe hook, In Fig. 9, springs 71 are shown as' a single spring,whieht'hey really are, considered electrically, though they mayconveniently be two in mechanical form.

The armature 50 carries a spring 75, so formed at its free end that thepin 7G. oorm ried by the switch hook 25, Wili pass freely by' thisformed end While passing upward. but will engage, in passing downward,with the result that the armature 50 on. suoli downward motion of thehooi( switch will be thrown towsi'd its magnet poles ss it' it Wereattracted by them. The relation oli the springs 75 and the pin T6 maybest be by comparing Figs. 2 and 7. This move nientot the armature 5G'will release o tooth mC the. oscapement Wheel M, thus permitting alinal step to the brush 53 to return it to its normal. position uponbanging up the re-.n

eoii'er after conversation. Further new in Fig. th 'certain of the pins,suoli as and others in that circlej will be, seen to be connected tocontacts in the tour series ot switch points, each series bovino; aiodio arm. The four radial arms associated with these series switchpoints are connected to .each other and to ground or to a ooi'oinon,

return wire. Each arm is adapted to set, to Contact with either of theten pins rin its series and thus to ground the conductor loading fromthat pin to a. `pin on the disk 5l or dial, as it may be called. Ninepoints in each of the tour series are provided with.

such wires. but the tenth pointhss no Wire d connection whatever. These.'four series of Contact points with their levers forni the oievice towhich have previously referred herein as an indicator. It will be seen'that the lett hand indicator lever in Fig. 9 rests upon its first orupper point and that .bis is connected to si pin on the dini. The see,-ond Contact of the letthond indicutor lever is connected to theconducting the dial which stands next to the right. Successive indicatorpins associated with that lever are connected to successive conductingpins in what may be callod the first quod rant of the dial, andsimilarly the second.4 third and fonrth quadrants, counting; clockwise,belong respectively to the second., third and fourth indicator lovers,counting from the left. it is the province. therefore., of eachindicator .loyer to ground one and only one of the conducting loins inits quadrant of the dial, :uid in practical use the 'posh tions of theindicator levers are indicated by some digit, 0 to 9., any sach digitexcept 9 indicating a position in whim one of the pins of the quadrantbelonging to that lever is grounded. lt the lover be upon the tenth orlast pin. of the indicator no pin in its diehquadrant will be grounded.

The central ollice apparatus is so designed as to cooperate with thesubstation signal transmitter as follows: Current impulses are sontlfrom the central otlico over line l' to ground, successively energizingand deonergizing electro-magnet 49, thus permitting brush 53 to steparound and successively.

lilo

connect with the points in its circle in proper synchronisin withselective stepping devices in the central otlice, the selective steppingdevices al the central ollice being further controlled by `groundcircuits encountered upon L1. Thus vwhen in the condition slm fu in Fig.t), the arni revolves in response to control ot electro-magnet iff. theln'ush 53 ceines into electrical connection with the fifth point whenthe central otlice stepping apparatus is in a position corrtwptnuling to0" thousands. since the digit arni 'l`h" is set upon t) thousands'. insimilar inanner the position o't` the digit arms Il, T, U are signaledto the ccntral otlice through the occurreiuze ot grounds upon L1 in thetravel of the brush 53 as controlled by impulses troni the centralottice over L2. Such control is taken Yfor the tour quadrantsindependently to provide for the four digits. l separate stepping deviceat the central otlice pertains to each digit 'and individuallycontrolled by the brush 557 when in the corresponding t'uiadrant. Thiscentral otlice stepping device is controlled by a series ot impulsesassociated with the impulses which step the brush 52 forward, thecentral otlice stepping device being stopped when a ground isencountered upon lj. Forthc selection of digit 0 on anyY digit arm, theground placed upon the tirst conducting pin of the quadrant; to selectdigit 9 on anyY digit arm, no ground is used, the central othce steppingdevice not being stopped by a ground upon L1, such stoppage beingunnecessary as the stepping de rice provided with ten steps and 'for theselection ot this digit 0f the stepping device passes to its lastpossible position. .As the ground on L is required only for those digitsin which the central ottico stepping' device rciliuircs to bc stoppedbetorc its extreme position is reached, it Jfollows that at tintes thegrounds cncrmntercd by the brush i'niay be Atower than iour. and in thecase ot' selection olf the number 09H5). no ground whatever would beencountered by the brush Bil.

As the province ot the indicator is to Iset up the digits ot the calledlincs number, and that ot' the dial to,havc one pin in cach quadrantgrounded tor control ot'thc centrat ottico machines, it will be seenthat.l with the exact construction described the pat-ron may call anynumber from 0000 to 099), or a total possible maximum of i000()diil'crcnt. numbers.

By providing' five levers in the indicator,

and tive series ot pins in the dial. any noniber to 90990 can be called,a total ot 100Mo() ditterent numbers. lu like manner any greater or lessnumber ot indicator levers and series ot dial pins may be provided.

ln Fig. 9 there are shown `tour indicator levers, respectively markedTh. H. T. and U, signifying that. a given. lever shall be used toindicate 'the digit standing in thousands, hundreds, tens or units placein the called number. The digits 0 to 9 adjacent to the points ot eachindicator are designate the particularity of the digit in each suchperiod. The lever positions shown in Fig. 9 are such as to call thenumber 236.

The pin 55 of the dial is 'tor convenience and certainty made somewhatwider of eon tact surface than are, the remaining pins.

This is connected electrically to the pin adjacent to and adjoiningonthe right the pin 55a. This isinturn connected to ground.

The switch hook Q5 being down and a call having been instituted byWinding up the train as described, the return of the handle i8 to normalposition steps the brush 53 from the pin 55a to the adjacent one throughthe described motion of the armature 50.

.ln this condition the circuit may be tracedtacts between 68 and 69 aswell as Gir and 66,

respectively are closed in this condition ot' parts. The successiveimpulses so received by the magnet 49 advance the arm'li)J by`successive steps, the first impulse causing itJ to step ott ot thegrounded pin adjacent to In passing through the first quadrant the brushengages a, grounded pin unless the, left hand indicator is for the digitD. ot her quadrant, as'controlled by the position ot' thecorrespoi'uling; indicator lever. T he proper stoppage of central otticocircuitst ilectingr switches will be effect-ed by impulses over wire L1when these grounds occur, or no stoppage will be effected if the digitbe S), and by successive impulses the brush 5? ultin'lately will rest onthe contact 55". in that position of the train, the hook switch Q5 canrise it the receiver be ri inoicd. although the pawl 27 will not yethave fallen to break contact between springst and (t. Upon the liftingof the lever 25, the making ot contact o'lE 7lwith70and the breaking of7f3 'fromTLlestablish an ungrounded talking circuit vfrom L1 to L2through the receiver S2 and transmitter 83 or through any otherarrangement. of telephone ii'istrumcnts'which may be pre'lmred. Theresistant-,e 84, whichis high relative to other parts of the circuits ofthe system, will be included in series with the line and telephonecircuit it the spring S5 and contact 86 be separated byv pressure on thebutton 87. During conversation this button The same will be true foreach,

ti t) through 111, 112, 109, 95, 9G, 110, 113, 114, 103, and toeartlnenergizing 103 and causing the brushes 10G-107 to step pt'Qrwarclone Step into connection with contacts NJW-105 respectively, which arethe Cuntaets correspuniling to the O-thousand granp or subscriberslines. Next, brushes 93-94 eonnect euntaets ll-lit and brushes 97- 98`Siinultaneously eonneet contacts 11T-- 11S: the former pair ol" brushesclose a eireui'u from positive terminal of battery to L2 and theneethrough T3, il., T9, Lit), ete., t0 earth, Causing hrnsh 53 to make aStep anti to pass into eontaet with the fifth pin, "'viiieh iseonneeterl to earth at' the substation; by this movement ot the brush 53a circuit: is elosefl from the. positive terminal of battery through therelay helix lill to N., 71.72, TS, 5T. 54, 52, fifth pin, thence, to thefirst or No. t) i point ol the thousands tlig'it indieator, :unlinaunlueh as the thnusands digit arm in Figi'. t", is Set upon thatpoint, the eirruit is ronipletetl to earth at the, snhistation thulenelgi'/ii-ri,Y the rela)v helix lit) and attraetinj ;l the armaturelll: hy the altrartion ot' the armature lll` the eirenit is elosetl frompositive pole ol" hatler)y through lli. lill. 11S, UH. 9T, 11T` h2, 12?,relay helix l2() to negativ(- pole ol' battery` whieh eireuit ia alla-king' wirt-uit to maintain the relay armature lll irulepeiulentlyol.I the eontinnanee ol' the suhstatilni rontavt ol' brush ily thilurking' oll the armature lll. the 'olullnlor IIL' is isolatell tronithe haltery terminal antl l'urther elnsinn ol' the rireuit ahorehwrrilwll as energizing magnet 101i is imposable. ln tlu` runtinuaneeolI the motion-ol liu` brushes. the hrusheh 9:5- ll; reperiti-ilyenergize alul ileinergi'lze man1 nel lf.) :unl thul yatep the hru h fr?)orer the lil-.at quzulrant ol' the signal transmitter` while hruslaw tt-JS hohl elosml the loi-lling eireuil ol' the relay whaling' lill. .\sthe hrushe l"a\i the tirenrv-lirst rontaet ol' their respeetire row theinviting' rirruit nll the rela \y helix l l) is hrolien: the hrush 523at this tiuu hay pauw-ll heronrl the liist pnulrant oly the -igualtransmitter anll is entering the .wl-mul (plallrant. H lalore. tlu`hruslul DI; .ll senti eurrentinxpulaes over the line lf to propel the lru h 32S. tluI brushes il@ Uli senil eurrent impulse4 through lll llLaiul thenre through wire ll alul li tu :feine Jfurther leril'e l'orinterpreting the'sl-eoml or lnnulrells (h it as ileternlinetl h thesetting` ot the. hunllrelis digit arm in Fig. t). s in the ease ot' thethousands digit, impulses will he sent hy brushes J5Y ilt' until brushIl?, eruounter a grounllell pin in the signal transmitter. uhereupon thearmature lli will he. attraetefl hy euereixatiun of helix llt) and willh'e retaineil h v energization ol helix llt), thereinr pri-rentinglfurther impulses Lef@ A and thus determining the Control el' theCligtant brushes aetine1 to seleet in res ense tn en 1 Y. y. control byrhe h'unureds digit arm 0i; we signal transmitter 1n a manner analogousu brushes 10U-#107 1n remunse lo eontrni n' l the thousanc s digit armuf the s; i

lnal tra mitter. The thiril anal fourth araulrants of thesignaltransmitter are eenrolletl by a. further rleriee Similar to that ntfFia. and the ligitai signals: 'ire-ni 'the brush :'53 are similarlyinterpreteti.

It has heen Het. forth that 'he :ugual tranan lnitter of thisapplieatien is adapted ie' operate with a type nl' automatic "'eiephoiswitching' syatein already l! .Quell elsewhere and innlerstomi in theart Le which this present intention pertains. onlyr auch portions of theentire system ingingy uf'fein cliseloed' as are required to illustratethe aneratien of the signal transmitter.

I elai1n-- l. ln a signal trainnnittifr nrtele changea. a spring-driven'1f-train. manual winding' means4 heretor, en netie elfeuwnient iur slail 5r-ai ,Ice ventral uflit'e, a allai eunirui nf -ing ailg'nlat ueriesit rontaets, a hruah driven hy Haiti gearirain and ailapiml sureessivelyto engage all the eontarta will lial. a llink earrieli by Haiti nu nalunnhag means alu-l haringr a notch in ns elige: nl a hell erunlr levernormally engaging sani link inl its noteh anti nornniily extending' neara nuirahle part of naill eseapeinent. Said hell erank lever heine:ulaptenl te he nuire-:l when lwill manual winfrling` means i5 epe atellanll then to he held by the elige of anni llislc in sut-h position thatit extenriei intoA the path of Saul niorahle part'l of .Quill einrapenient whereby salti eseapetnentis me rhanieally luf-kerl againatfleetrunagnetie operation hiring the aut ut' winding. L). ln a signaltraikisniitter, a lriwn gear-train,` ymanual winding; u therel'or. aneleerrtunainetie rseapement ,er faul geararain, a (liai emnpriuingatijar" t series* ot' contacts, a brush iirireli. by Saul war-train anlladapted sueeeanirely to enragfe all the eontaets et Saiil nia-l, anti nlever pmitionell to engage the nun'ahie-gnirt ot sa'ul manual' windingmeans aiu'l a mm2 able part o'l.' haiti eseapenient, whereby by then'mrelnent or' .Call winding means te inatitute a rali. .wahl lerer iSmarmi anti anni eseapenunt ir; aetuateil meelninieally to m? ranre Saulhrush troni it.r`l normal parution,

2l. In a signal transmitter tra' antoniatie exehanges, a inain-,apringirand a rear-train tlriren thereby, an electroinafnetie escapenient torsaid gear-train, a (irai eonipriaing alljaeent' series nl' eontaets. ahruslh flriren hy laaill `rear-train and allaptell 'to engage theeontaets of `aan! (tial. and manual wind ing means for Saul main-springSeiloci- A ment for said ing against return to normal position 7whensaid main-spring is partly ivoiind and self loch-ingl against furtherwinding after return to normal. position and before full operation ofsaid gear-train.

l. .in a signal transmitter for automatic exchanges, a main-spring and ageant-rain driven thereby, an electiomagnetic escapegear-train, a. dial.comprising adjacent series of contacts, a brush. driven by saidt,emr-train and adapted to engage the contacts ot said dial, and manualWinding means for said main-spring self-lool;- ingi against return tonormal position When said main-spring partly Wound and sellloclftingagainst further winding after return to normal position. and before fulloperation of said escapement.

5. ln a signal transmitter for telephone exchanges, a main-spring, agear-train driven thereby, an electromagnetic escapoment for saidgear-train, a circuit for said escapement, a contact dial, a brushadapted successively to engage the contacts thereof,

and manual winding means for said mainspring self-locking against returnto normal position when said main-spring is partly Wound and adapted tointerrupt said escapement circuit when the Winding means is not innormal position.

6, ln a signal transmitter for `telephone exchanges, a main-spring, a.gear-train driven thereby, an electromagnetic escapemeut for idgear-train, a circuit for said eacapemei a Contact dial, a brush adaptedsuccessiv .to engage the contacts thereof, and mar l Winding means :for.mainspring ses l .king against return. to normal position when saidmain-spring is partly Wound. and adapted to interrupt said escapementcircuit when said main-Spring is partly Wound.

i". fi a telephone signal transmitter, a main spring and manual Windingtherefor, a gear-train driven by said mainspring, an electromagneticescapement for said rear-trio. a. circuit for said escapement, and meansadapted to open said circuit at the beginning ot' the manual operationezt said Winding' .means and to hold said circuit open until the returnto normal oll said Winding means. y

El. lo a telephone signal transmitter, a main-spring and manual Windingmeans therefor. gear-train driven by said mainspring, an electromagneticescapement for said gear-train, a circuit for said escapenient, andImeans adapted to open said circuit i n.; the, manual Winding of saidmeinem. and rurther msnm :tor opening l l l i l l l l Losa-,cee

said circuit when said gear train is in its normal. position of disuse.

`wind said main spring, paivls adapted to i obstruct said handle againstreturn to normal position until said main spring has been Wound to apredetermined degree and to obstruct said handle against return tonormal position after a Winding to a predetermined degree, and toprevent. the further operation of said handle until said gear-train hasreturned to normal. position.

l0. In a substation telephone, an electromagnetic eseapement and agear-train controlled thereby, a gear-train 'when elevated, acontact-dial and a brush therefor, means adapting Said brushsuccessively to close circuits through contacts ot' said dial, onecircuit being possible for each digit of a called telephone number, andmechanical means adapted to advance said brush from position ofconversation. to normal position when said switchhook is depressed..

switch-hook locking1 said l1. ln a substation telephone, a rotary.

signal transmitting mechanism having a stop position completing circuitsfor conversation upon a call originating at the substation telephone,and havinganother stop position completing circuits adapted forconversation upon calls terminating at the substation telephone; aswitch hook lever forming a part. of the substation telephone;

' and mechanical mutually engaging members upon. said lever and upon thesignal transmitting mechanism whereby by the downvfard movement of saidlever after conversation the signal transmitting mechanism is advanccdbymechanical control to its position for receiving calls.

l2. .ln a substation telephone, a contact dial and a. brush therefor, agear train driving' said brush, an escapement z(governing the movementoit 'said gear train and having vibratory member; a hook switch lever;and cooperating members upon said lever and upon the vibratoriT memberof said escapemeiit and adapted 'to engage each other by a downwardmotion of said lever whereby said brush is advanced by a downwardmovement of said switch lever.

Signed b v me at Piqua, county of Miami,

tatate of Cillo, in the presence, ot' two Wit-1 Gnocca Vanoise, Cima-ansRosso LAWRENCE.

